My recommendation will be slightly biased
In all seriousness though, it depends on what you want.
If you want navigation directions in the MFD, and want Bluetooth phonebook to show up in MFD too (with an additional BT module) or other perks like voice control for navigation / phone calls you need the RNS-510. The RNS-510 itself is available from a forum sponsor here for about $1,300 installed, and the BT module pricing depends on what you are after, information here:
Summary of Bluetooth Options for RNS510 & RCD510
If you don't mind on the MFD phonebook & voice control functions, Zenec is an alternative. Keep in mind though, the RNS-510 purchased through the forums or on eBay is cheaper than the Zenec (at just under $2,000) if you pass on the BT module. However, Zenec has a big advantage in that it uses iGo Primo as its navigation, which is MUCH better than the VW OEM software and your AVIC-F9310BT. It will also be more flexible with media formats / DVD playback, and have the necessary connections you need to hook up an aftermarket sound system. The user interface is also different, have a poke around on YouTube, whether VW OEM interface is better or Zenec is entirely up to you.
Now if you don't mind navigation directions in the MFD, the ANS series units I sell is yet another alternative, coming in at half the price of the local dealer alternative RNS-510. These units mimic the RNS-510 interface but combine aftermarket flexibility that Zenec offers (read from SD, USB, iPod etc, have RCA line-level outputs for sound systems, plays video files from SD / USB, etc). It also uses the iGo Primo navigation system. It has some extra perks like OBD functionality (to be released) but also has some down sides. Long story short, there are some drawbacks and bugs in its media functions at the moment, but a new generation of these units is just over the horizon (expecting to get it at the end of the month) and will have smartphone spec hardware, fix all the software issues and introduce more unique functions etc. More info if you follow the link in my sig.
It comes down to the navigation software used. Just try any in-dash units that run iGo Primo and you'll see the difference - none of my customers who have used TomToms miss using the TomTom system at all
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